+1. This is such a cool feature. It's what I call an attribute-driven search engine. The attributes (or tags in this case) are shown for the current search results and can be clicked to further filter your results. I've built similar search engines before, but I like the way StackOverflow does it so much that I've copied some of their ideas for my own site.
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Steve WorthamAug 27 '09 at 17:16

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Sorry, I forgot to mention this. But the one benefit of browsing the site this way is that you can't reach a dead end (0 results). And that, in my opinion, is what makes it a cool feature.
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Steve WorthamAug 27 '09 at 17:22